Slide rest of lathes



A. DRUMMOND.

SLIDE REST OF LATHES.

APPLICATION FILED JULYZI, 1921.

1 ,426,365, I Patented Aug. 22, 1922.

4 1W {1 $91 .=;A l-ch'e w-g 1 5 I earner ARTHUR Denim/Lor n, osrtrnns HILL, ivnaieeurrnronn, ENGLAND, w

SLIDE REST OF LL ATHES. I

masses.

I Specification of LettersiiPatent Pat nt d g; 22,192 Application filed July 27, rea seria No. 487,932.

(GRANTEDiUN-DERTI-IE PROVISIONS or runner-er rJrARciI 3, 1921,41 STAT; 13 13.) a

I over the edge of 'the' 'table' and'by thebolt To aZZ whom it may concern.-

Be it known that I, ARTHUR DRUMMOND,

a subject of the King of Great Britain, re-

siding at Rydes Hill, near Guildford, in the county of Surrey, England, have invented certain newand useful Improvements in or- Relating to the Slide Bestsoff Lathes (for' have file'd'an application in Great. Britain July 12, 1919, Patent No. 144,496)

which f of which the following is a specification.-

This invention relates to the sliderests of lathes, including the cross or middle'slide and top slide or tool holder, and 'has for its chief object to construct these partsirra manner which allows of, maximum economy of manufacture and: enables accurate workmanship and fitting'to be dispensed with.

while providing for reasonable accuracy in operation. The

cially designed for small and cheap lathes' where it is essential that'hand labour in fitimprovements ting shall be reduced to a minimum;

According to the main feature of this invention the sliding member (either the middle or top slideor both) is formed under neath with a single V groove atone side and a flat surface at the other and is adapted to slide at the said groove and surface respec 'tlvely upon a pair of round guide rods fitted on the carrying member. Byv employing a single V groove and a fiat surface no accurate fitting is needed, asthe actual guiding is eflected by one onlyof the guide rods acting through the V groove and the other rod merely keeps the sliding member level and may make contact with any part of the fiat surface. I I

As appliedto the mounting-of the cross slide on the main slide thetable of the cross slide is formed with the V groove and flat surface and a central recess receiving the tapped base or clamp plate, which is secured to the table by screws and through which passes'the screw effecting the movements ofthe cross slide, the clamp plate extending under the guide rodsto hold the-table in place. Th'e-bodyof the crossslide is mounted in an a'ngul'arly'adjustable -mannerupon the table, between the body and the table being-placed a thin brass or other graduated plate. secured by bending downone edge are espea anda tapped clamp plate.

In order thatjthesaidinvention may beclearlyunderstoodand readily carried into effect the same will now be described more fully with reference to the accompanying drawings, in whichzf I Figure 11s a front elevation; a side elevation and Figure 3a plan of the "slide restof a lathe includingthe saddle, middle slide and top sl-id'e fitted in accord ance with this invention. 1 I Figure 4. isa front view of'the the cross slide with its clamp plate,

Figure 5 is an end view .with its clamp plate; and 1 .Figures 6 and? are respectively a plan "and edge view of the graduated plate.

jlAis th'e'fmain s'lid'e or saddle-provided odsbetween the holder of the top slide Figure 2 table with a pair of guide rods 13. C is the imiddle or cross slide t'ab'le' mounted upon the rods-B and held upon them by the clamp plate D; isthe body of fthe cross slide mounted upon the table C by means of the bolt 6 which passes through "the lug e at the c H frontof the body the bolt forming a fuls crum around which the" slide canwturn.

is the graduatedplate. Gris thetop slide,"

The cross slide table 0' can beconveniently .made by cutting into short lengths along barshaped ina single, length by a'milling or other machine'so as to form atthe under surface theVlgrOOve 0, the-central recessed part 0 and'the flat 'bearingsurface at the oppositeside 'tothe groove',' the surface and groove "beingiso related that when the table is supported upontheguide rods Blitwillbe level. Thei clamp plate 1) projects. into the recess 0" and is secured iin-place by two pairs of screws 6291) "each side of the central:

tapped hole cl through which passes the screw a belongingfto the saddle: A, the screw beingsupported' in the end lugsa' of thev saddle. 1 On the front end of theascrew. is a handle a byv which it isturned to move the cross slide to and fro along the saddle." The screws (Z are tightened up just sufliciently to cause a slight grip 'upout-he rods without.

hindering the movement of the cross slide and to render the action as smooth as possible the sides (Z of the clamp plate are slightly rounded at the upper face as shown in Figures 2 and l. The saddle A is formed with holes which allow of the removal and insertion of the screws (Z when the cross slide is brought into a convenient position.

The table C is provided with the tapped central hole 0 into which the bolt 0 screws, the head of the bolt bearing through a washer on the upper side of the semi-circular lug or flange below which is the graouate d plate ll. As shown in Figures 6 and 7 thls plate formed with a-central hole through which the bolt 6 passes and the graduations are arranged'in a semicircle concentric with the bolt hole. To secure "the graduated plate with aminimum of labour and withsufiicient accuracy it made slightly longer than the table C so as to project at one side. To prevent it turning on the table it is laid in position and a swage having a central stud and a lip at oneside is placed upon it with the stud in the bolt hole of the table and the swage is then given a blow causing the projecting edge of the plate to be bent over in the form'of a lip or flange f The plate is therefore prevented from turning by the downwardly projecting flange so formed andwhen'the'slidebody E is placed in position the angle to which it is adjusted can be read with considerable accuracy by means of a mark 6 on the lug e and the graduations f of the plate F. The graduations can be stamped upon the plate.

The top slide or tool holder G is guided in a similar manner to thecross slide by means of a, pair of rods Bon the cross slide, the top slide being formed at its under side with a v groove 9 and flat surface 9 separated by a recess 9 The slide G is held on the rods B by its clamp plate H provided with the tapped hole A through which the screw 6* of the cross slide passes. The clamp plate H is, as inathe case ofthe clamp plate 1), made with sides 72, having a slightly curved upper surface and is secured to the top slide by the screws if. The cross slide is formed with holes giving access from below to the screws if.

The top slide is cast as a single'block with a lug or boss on its upper side having a pair of holes 9 g at right angles to each other, adapted to receive the tool either for turning'or boring according to the hole 9 or g employed. A set screw 9 in the boss of the holder at-the point of crossing of the holes serve to secure the tool in place.

To allow of economical fitting of the screwsa and 6 they are turned with small grooves a and 6 just beyond the end of the s was portion, as shown in dotted lines in -Figures l" and2, J- respectively; and: a. pair of pins a e are driven into pin holes in the bearing member (either the cross slide or the saddle), the pins when in position engaging in the small groove at opposite sides. The screws are therefore held in place in their respective slides. The handles'of the screws a, 6 are as shown fitted to small discs and these'are preferably secured by simply driving them on to slightly coned surfaces at the at one side a flat bearing surface, a clamping plate having outwardly projecting sides secured to the bottom of said slide, a-carrying member, a pair of round guide rods in said member, said rodsloosely engaging said projecting sides to permit the slideto be movably secured to said carrying member.

3. In a lathe, a cross slide, a sliding table upon which the cross slide is'mountedin an angularly adjustable manner, a'securing bolt I and a graduated-plate showing the angular ad ustment, which plate is secured between the slide and the table and is provided "with a lip bent down over the: edge of the table to prevent turning of the plate.

4. In a lathe,a cross slide, a sliding table upon which the cross slide is mounted in an angularly ustable manner, a securing bolt and a graduated plate showing theangular adjustment, wnich plate is secured between the slide and the table and is provided with a lip bent down over the edge of'the table to prevent turning of the plate, a slide rest, a

pair of round rods fitted horizontally in the said shde reshagroove 1n the underside of the cross slide table at one side thereof'and a flat bearing surface at the other side, the

' said groove and flat surface sliding upon the said pair of round rods.

5. In a lathe, a slide havlng its under surface provided with a ll-shaped grooveand a flat bearing surface separated by a central recess portion, a carrying member having a pair of round guides mounted therein, and a clamp plate secured to said slide provided with means engaging said guide rods for slidably securingthe parts together.

6. In a lathe, 'a' slide'having its'under'surface provided with a central recess, 'a V-shapedgroove on-one slde of said recess, and a flat bearing surface in the other side thereof, a clamp secured to the bottomiof said Sl1d8,'& carrying member, a ,pair of guides 111 'sald' carrying member, one of which is adapted to contact with said il-shaped groove and the other With the said bearing surface, and means on said clamp for slidably securing the said slide to the carrying member.

7 In a lathe a slide having its under surface provided With a central recess,- a V-shaped groove on one side of said recess, and a flat bearing surface in the other side thereof, a clamp secured to the bottom ofie 

